I believe the blocks will be distributed across data nodes and not local to only one data node. If this wasn't the case, then running a MR job on the file would only be local to one task tracker.
Alex On Thu, Apr 23, 2009 at 2:14 AM, Xie, Tao <xietao1...@gmail.com> wrote: > > If a cluster has many datanodes and I want to copy a large file into DFS. > If the replication number is set to 1, does the namenode will put the file > data on one datanode or several nodes? I wonder if the file will be split > into blocks then different unique blocks are on different datanodes. > > -- > View this message in context: > http://www.nabble.com/The-mechanism-of-choosing-target-datanodes-tp23193235p23193235.html > Sent from the Hadoop core-user mailing list archive at Nabble.com. > >
